Rolex. An attractive 18K gold automatic calendar wristwatch with sweep centre seconds and coral-red lacquered dialSigned Rolex, Oyster Perpetual, Day-Date, ref. 1803, case no. 5'100'309, manufactured in 1978Cal. 1556 automatic movement, 26 jewels, coral-red lacquered dial, applied gold baton numerals with luminous accents, sweep centre seconds, aperture for day, magnified window for date, tonneau-shaped water-resistant-type case, milled bezel, screw back, screw down crown, 18K gold Rolex President bracelet, case, dial and movement signed36 mm. diam.